Why Aren\'t Orphan Records Being Deleted with JPA CascadeType.ALL?

JPA CascadeType.ALL Not Deleting Orphans

When using JPA with the @OneToMany mapping with cascade = CascadeType.ALL, it's expected that orphan nodes will be deleted when the parent entity is deleted. However, in certain cases, orphan records might persist in the database.

Solution:

With Hibernate:

If using Hibernate, the CascadeType.DELETE_ORPHAN annotation can be added in conjunction with CascadeType.ALL:

<code class="java">@OneToMany (cascade = {CascadeType.ALL, CascadeType.DELETE_ORPHAN}, fetch = FetchType.EAGER, mappedBy = "owner")
private List<Bikes> bikes;</code>

Without Hibernate:

Without Hibernate, the orphan records must be explicitly deleted before deleting the main record:

1. Fetch the main row to be deleted.
2. Fetch the child elements.
3. Delete all child elements.
4. Delete the main row.
5. Close the session.

JPA 2.0:

JPA 2.0 introduces the orphanRemoval flag:

<code class="java">@OneToMany(mappedBy="foo", orphanRemoval=true)</code>

With orphanRemoval = true, orphaned records will be deleted when the parent entity is deleted without the need for manual deletion.

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